[CentOS] SATA vs. SAS

>> Option 1) 2 servers each having 2.0TB raid disk with SAS 
>> drives, 2GB ram and standard other features. 
> 
> If going down this road, why not look into getting one of
> those fancy new storage enclosures where the RAID is built
> into the enclosure and can allow 2 servers to simultaneously
> access the arrays with full battery backed write-back cache?
> 

What is available for Linux in this department?